<?php
    function filled_out($form_vars) {
        //test that each variable has a value
        foreach ($form_vars as $key => $value){
            if((!isset($key))||($value == '')) {
                return false;
            }
        }
        return true;
    }

    function valid_email($address) {
        //check an email address is possibly valid
        if(ereg('^[a-zA-Z0-9_\.\-]+@[a-zA-Z0-9\-]+\.[a-zA-Z0-9\-\.]+$',$address)) {
            return true;
        }else{
            return false;
        }
    }
?>